Chukhrovite-(Ce) Mineral Data

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General Chukhrovite-(Ce) Information

Chemical Formula:

Ca3(Ce,Y)Al2(SO4)F13•10(H2O)

Composition:

Molecular Weight = 824.71 gm

Calcium 14.58 % Ca 20.40 % CaO

Cerium 12.74 % Ce 14.92 % Ce₂O₃

Yttrium 2.70 % Y 3.42 % Y₂O₃

Aluminum 6.54 % Al 12.36 % Al₂O₃

Hydrogen 2.44 % H 21.84 % H₂O

Sulfur 3.89 % S 9.71 % SO₃

Oxygen 27.16 % O

Fluorine 29.95 % F 29.95 % F

- % F -12.61 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Ce_0.75Y_0.25Al₂(SO₄)F₁₃•10(H₂O)

Environment:

Hydrothermal barite-fluorite vein deposit.

IMA Status:

Approved IMA 1960

Locality:

Clara mine, near Oberwolfach, Black Forest, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for its relation to chukhrovite-(Y) and content of cerium as the dominant rare-earth element.

Synonym:

ICSD 61184

PDF 43-667

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Chukhrovite-(Ce) Crystallography

Cell Dimensions:

a = 16.8, Z = 8; V = 4,741.63 Den(Calc)= 2.31

Crystal System:

Isometric - DiploidalH-M Symbol (2/m 3) Space Group: F d3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 9.75(1), 5.93(0.8), 3.22(0.7),

Physical Properties of Chukhrovite-(Ce)

Cleavage:

{???} Indistinct

Color:

White.

Diaphaneity:

Transparent to Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Hardness:

3 - Calcite

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Chukhrovite-(Ce)

Optical Data:

Isotropic, n=1.443.

Calculated Properties of Chukhrovite-(Ce)

Electron Density:

Bulk Density (Electron Density)=2.26 gm/cc
note: Specific Gravity of Chukhrovite-(Ce) =2.31 gm/cc.

Fermion Index:

Fermion Index = 0.0006224655
Boson Index = 0.9993775345

Photoelectric:

PE_{Chukhrovite-(Ce)}= 65.71 barns/electron
U=PE_{Chukhrovite-(Ce)} x r_electron= 148.80 barns/cc.

Radioactivity:

GRapi = 13,324.68 (Gamma Ray American Petroleum Institute Units)
Concentration of Chukhrovite-(Ce) per GRapi unit = 75.05 (PPM)

Chukhrovite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

**Estimated Radioactivity from Chukhrovite-(Ce)** - weak
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For One Hour
1000 gm / 9.39 cm	285,427	7.71E-06	13,324.68	4.38
100 gm / 4.36 cm	28,543	7.71E-07	1,332.47	0.44
10 gm / 2.02 cm	2,854	7.71E-08	133.25	0.04
1 gm / 9.39 mm	285	7.71E-09	13.32	0.00
0.1 gm / 4.36 mm	29	7.71E-10	1.33	0.00
0.01 gm / 2.02 mm	3	7.71E-11	0.13	0.00
0.001 gm / 0.94 mm	0	7.71E-12	0.01	0.00

Weight of pure Chukhrovite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 2.31 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.64 % Th) From Sum REE Elements (12.74 % REE)

Chukhrovite-(Ce) Classification

Dana Class:

12.01.05.02 (12)Compound Halides

(12.01)with miscellaneous anions

(12.01.05)Chukhrovite Group

12.01.05.01 Chukhrovite-(Y) Ca3(Y,Ce)Al2(SO4)F13•10(H2O) F d3 2/m 3

12.01.05.02 Chukhrovite-(Ce) Ca3(Ce,Y)Al2(SO4)F13•10(H2O) F d3 2/m 3

12.01.05.03 Meniaylovite! Ca4AlSi(SO4)F13•12(H2O) F d3 2/m 3

12.01.05.04 Chukhrovite-(Nd)! Ca3(Nd,Y)Al2(SO4)F13•12(H2O) F d3 2/m 3

Strunz Class:

03.CG.10 03 - HALIDES

03.C - Complex Halides

03.CG -Aluminofluorides with CO3, SO4, PO4

03.CG.10 Chukhrovite-(Ce) Ca3(Ce,Y)Al2(SO4)F13•10(H2O) F d3 2/m 3

03.CG.10 Chukhrovite-(Y) Ca3(Y,Ce)Al2(SO4)F13•10(H2O) F d3 2/m 3

03.CG.10 Meniaylovite! Ca4AlSi(SO4)F13•12(H2O) F d3 2/m 3

03.CG.10 Chukhrovite-(Nd)! Ca3(Nd,Y)Al2(SO4)F13•12(H2O) F d3 2/m 3

Other Chukhrovite-(Ce) Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Chukhrovite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Chukhrovite-(Ce)

Ca3(Ce,Y)Al2(SO4)F13•10(H2O)
Dana No: 12.01.05.02 Strunz No: 03.CG.10
Locality:

Notes: